CRT is a device which convert electrical signal into visual signal.
The primary output device in graphics is Video Monitor. The most of the Video Monitors work on the Standard CRT design.
➤ How CRT works:
➺ Electron Gun: It consists of heating filament. It generates negatively charged electron and accelerated towards the phosphorous coated screen.
➺ Control Grid: It is going to control the flow of electrons so that electrons do not move freely inside the vacuum tube. Grid focuses and pass electron beam at high speed.
➺ Focusing System: It is used to create a clear picture by focusing electron into narrow beam.
➺ Deflection System: It controls the direction of electron beam by using electric or magnetic field.- Vertical Deflection Plate: It deflects electron beam in Up and Down direction on the screen.
- Horizontal Deflection Plate: It deflects electron beam in Right and Left direction.
➺ Phosphor Coated Screen: The inside front surface of the every CRT is coated with phosphor. Phosphor glows when highly energy electron beam hits the screen.